1. 71% of the eath's surface is covered by water, over two thirds of the planet's surface.
2. The Greenwich Meridian Line runs through the Arctic Sea, the North Sea, the Mediterrannean sea, the South Atlantic Ocean and the Southern Ocean.
3. The North Atlantic is the world's most heavily fished ocean area.
4. Krill is a shrimp-like zooplankton (animal plankton), and it is important to Humpback whales because they eat it.
5. 610 million tonnes of phytoplankton (plant plankton) grow in the Southern Ocean every year.
6. Top predators are most at risk from pollutants because many polluting chemicals bioaccumulate (build up) up the food chain.
7. 80 million tonnes of fish are caught every year by marine fisheries. Other creatures at risk from fishing include dolphins and turtles cuaght in nets, and sea birds, such as albatrosses, which get caught on long lines of baited hooks.
8. The deepest known point in the ocean is the Mariana Trench, which reaches depths of over 36,000 feet (11,000 metres).

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